Element Location for the ADA Array
Abstract
The structure of the hydrophone element mounts used in the ADA array may lead to slow changes in the actual element locations during the operating period and, in particular, during the ascent and descent operations when significant changes in temperature and in structural stress in the pressure hull can occur. In view of this, we intend to implement an acoustic element location system which can monitor the positions of the elements in nearly real-time. The approach to the localization system is to establish a base-line array of high frequency reference transducers around the periphery of the array. This set will be rigidly coupled to the deck so that the locations can be measured during installation and can be assumed to be stable within the required tolerance. This will clearly be true with respect to distances along the deck, but some curvature or deformation could occur over the full length of the deck in what will be called the 'z' axis. A series of bootstrap calibrations down the full length of the array will hopefully measure any such deformation. If the cumulative error in such a measurement proves to be too large, data can be derived from observation of a distant source with a number of selected elements whose local relative geometry has been determined by the nearfield calibration system.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 14, 1977
- Accession Number
- ADA074975
Entities
People
- V. C. Anderson
Organizations
- Scripps Institution of Oceanography